66403090 has 16 divisors (see below), whose sum is σ = 128720088. Its totient is φ = 24518016.

The previous prime is 66403079. The next prime is 66403091. The reversal of 66403090 is 9030466.

It can be written as a sum of positive squares in 4 ways, for example, as 37662769 + 28740321 = 6137^2 + 5361^2 .

It is not an unprimeable number, because it can be changed into a prime (66403091) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 255267 + ... + 255526.

Almost surely, 2^66403090 is an apocalyptic number.

66403090 is a deficient number, since it is larger than the sum of its proper divisors (62316998).

66403090 is a wasteful number, since it uses less digits than its factorization.

66403090 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 510813.

The product of its (nonzero) digits is 3888, while the sum is 28.

The square root of 66403090 is about 8148.8091154475. The cubic root of 66403090 is about 404.9450517334.

It can be divided in two parts, 6640 and 3090, that added together give a triangular number (9730 = T₁₃₉).

The spelling of 66403090 in words is "sixty-six million, four hundred three thousand, ninety".